Hi Sensifire, there is no built in API for doing this - but it would be straight forward to implement yourself. You would need to:
Add a handler that converts mouseover / mouseout into some kind of hover event.
Query the relevant layer on reciept of the hover event (use provider.ExecuteIntersectionQuery )
Create a control of your choice - populate with relevant data and move to the position on the map (possibly taking into account the position of the feature relative to the viewport and offsetting accordingly)